之前账号的文章1：android各种格式文件的打开

public Intent getIntent(File file, String str) {
Intent intent;
Uri uri;
intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
switch (str) {
case "ppt":

uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
break;
case "xls":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/vnd.ms-excel");
break;
case "doc":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/msword");
break;
case "chm":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/x-chm");
break;
case "txt":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "text/plain");
break;
case "pdf":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/pdf");
break;
case "PNG":
case "jpg":
case "png":
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "image/*");
break;
default:
uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/msword");
break;
}
return intent;
}